Lamp socket with side switching mechanism



Deco 10, 1946. c, BRAMMgNG 2,412,439 LAMP SOCKET WITH SIDE SWITCHING MECHANISM 4 Filed June 10, 1944 SSheets-Sheet l Y INVENTOR. CHEL BEAM/WING.

ATTORNE Dec. 10, 1946. c. BRAMMING 2,412,439

LAMP SOCKET WITH SIDE SWITCHING MECHANISM Filed June 10, 1944 3 Sheets-Sheet 2 I I T v Q ICHEL Be ags MMGM 14 TTGENE Y Dec. 10, 1946. c, @AM NG 2,412,439

LAMP SOCKET WITH SIDE SWITCHING MECHANISM Filed June 10, 1944 3 Sheet s-Sheec 3' 10 10 H, Cj 100 6, 17 j CZ INVENTOR. CARL BEA MM/NG.

v WMWG. M

Patented Dec. 10, 1946 LAMP SOCKET WITH SIDE SWITCHING MECHANISM Carl Bramming, Anderson, Ind., assignor to The Mantle Lamp Company of America, Chicago, 111., a corporation of Illinois Application June 10, 1944, Serial No. 539,757

17 Claims. 1

This invention is an improved construction of socket for electric lamps, which includes switching mechanism mounted in the side of the socket construction for controlling the circuit to the lamp bulb mounted in the socket, as a result of which the over-all dimension of the socket construction axially thereof may be the minimum required for properly supporting the lamp bulb and effecting connection between the terminals of the socket, and the electric conductors used to supply current to the socket. Heretofore, switch sockets for lamp bulbs have been provided with switching mechanism of one kind or another in the base of the socket construction below the structure employed to receive and support the lamp bulb, which has resulted with said earlier constructions, in necessarily giving the socket construction an axial length sumcient to mount the'lamp bulb and in addition, the extra axial length required to accommodate the switching mechanism. By the present invention, the additional axial length required to accommodate the switching mechanism is eliminated, since the switching mechanism is contained in the side of the socket construction, said switching mechanism being constructed to quite as effectively control the circuit to the lamp bulb as with switch sockets of the kinds heretofore used. The switching mechanism of the invention includes a switch knob or button outside of the enclosing shell of the socket construction, which button is movable to circuit-closing and opening positions, said buttons having connection with a cam of the switching mechanism, cooperating with a movable switch member of spring construc- I tion, so arranged relatively to the cam that movement of the button to its circuit-opening position imparts a substantially instantaneous movement of the switch member away from the switch contacts of the switching mechanism to open the circuit to the lamp bulb, and movement of said button to its circuit-closing position imparts a substantially instantaneous movement to said switch member to' engage and electrically connect the contacts of the switching mechanism, to close the circuit to the lamp bulb. The construction of the invention has therefore all of the advantages of so called snap switches, without requiring the axial length of the socket construction to be greater than that required to support the lamp bulb and to accommodate the connections between the terminals of the socket with the electrical conductors employed to supply current to the socket.

More specifically, the invention provides a base 2 of insulating material having a tubular member of thin sheet metal to receive and make electrical contact with the metal sleeve on the base, of the lamp bulb used with the socket, in a manner common in lamp socket constructions, the base being provided with a central contact for engaging the central end contact of the lamp bulb when the lamp bulb is held in place in the socket. The base of the socket construction is provided with a side recess in which a switching member of thin spring metal is mounted for free movement axially of the base, the switching member having surfaces cooperating with a cam movable relatively to the switching member axially of the base, by a button located outside of the shell of the socket construction, which button is movable axially oi" the base to operate said cam. The switching member and cam are constructed so that for the upper position of the button, when viewing the socket in an uprightposition with the lamp bulb extending above said socket construction, the switching member is pressed downwardly into firm engagement with the contacts of the switch structure, one of said switch contacts being electrically connected with one of the lamp bulb contacts, and the other of said switch contacts being connected with one of the socket terminals for connection with one of the electric supply conductors, the other of the socket terminals for connection with the supply conductors being electrically connected in the socket construction with the other of the lamp bulb contacts.

The socket construction not only reduces the axial height thereof to a minimum, but it accomplishes the results described by simple means which may be cheaply produced, without in any way interfering with the effectiveness of operation of the structure.

The objects of the invention are to produce a switch socket for use with electric lamp bulbs constructed as described and having the advantages set forth.

The invention will be best understood by reference to the accompanying drawings illustrating a preferred embodiment thereof, in which- Fig. 1 shows the assembled socket construction in plan view,

Fig. 2 shows the structure of Fig. 1 elevation,

Fig. 3 is a sectional view of a part of the structure shown in Fig. 1, taken along the line 3-3 in Fig. 1,

Fig. 4 is a sectional view of the structure shown in Fig. 1, taken along the line 6-4 in Fig. 1,

in front Fig. 5 is a left-hand side elevation of the structure shown in Fig. 1,

Fig. 6 is a right-hand side elevation of the structure shown in Fig. 1 with the switch button removed, this view being taken along the S 6 in Fig. 1,

Fig. 7 is a sectional view of a part of the structure shownin Fig. 1 taken along the line 7-1 in Fig. 1,

Fig. 8 is a sectional view of a part of the structure shown in Fig. 4 taken along the line 8-8 in Fig. l,v

Fig. 9 is a sectional view of a part of the structure shown in Fig. 4 taken along the line-99 in Fig. 4, and shows the switching mechanism in its circuit-closing position,

Fig. 10 is a View similar to Fig. 9 showing the cam of the switching mechanism in its position immediately before the switching member of the switching mechanism is snapped toward its circuit-opening position,

Fig. l1.is a view similar to Fig. 9 showing the switching mechanism in its circuit-opening posi tion,

, Fig. 12 shows a view similar to Fig. 9, the cam of the switching mechanism in its position immediately before the switching member is snapped to its circuit-closing position,

Figs. 13 and 14 are detail views of the cam of the switching mechanism, and are respectively a front elevation-and a side View thereof, and r Figs. 15 and 16 are detail Views of the switching member of the switching mechanism, being respectivelya front elevation and a side elevation thereof.

Similar numerals refer to similar throughout the several Views.

As showrr in Figs. 1-6 inclusive, the socket construction includes a base I 9 of suitable insulating material such as. porcelain, Bakelite or the like, having a cylindrical bore containing a tubular member I l of thin sheet metal which is threaded to engage the corresponding threads on the sleeve contacts of lamp bulbs to be used with the socket construction. The tubular member H is secured to the base II) by rivets l2 and I3. The base it is provided at the bottom of the bore containing the member H, with a central rivet l6 electrically connected with a contact member 55 extending to a terminal and binding post ltd contained in a recess lila in the base lli (Figs. 1 and 3). The base H3 is provided with a second side recess lflb (Figs. 1, 4 and 6) containing the switching mechanism ofthe structure.

parts .As more clearly shown in Figs. 9-12 inclusive, l the switching mechanism of the socket construction includes a cam iii of suitable material, for example metal or insulating material, and a switching member l'l together with switch contacts l8 and .l 9 mounted on the lower end of the base It for electricalengagement with a contact block lid of the switching member I! when the latter is in its lowermost position indicated in Figs. 9 and 10.

The cam I6 is substantially cylindrical for cooperation with opposite cam points lib, llb of the switching member ll. The switching member ll is of thin spring metal and is in the general form of a U.(Figs. 15 and 16), so that its upper ends may move towards each other by its spring action, or be separated by the action of the cam lathe lower mideportion of said switching member having secured thereto the contact block I la.

The recess lilb is provided with a further recess liic foritheblock l To for engagement with the end of said block, when said switching member is line raised by movement of the cam l6 below the cam points l lb, llb of the switching member, alt which time the spring action of the member li causes movement upwardly of the said member, until the contact block lla is in contact with the upper end of the recess l to. When the cam it is raised above the cam points llb, llb, the spring action of the switch member I? holds the contact block Ila down in firm electrical contact with the switch contacts l8 and l 9.

With the switching member ill in its lower position closing the socket circuit to the lamp bulb as shown in Fig. 9, when the cam E6 is moved downwardly until'it just passes the cam points;

the switching member ll downwardly, and that movement of the cam l t downwardly serves to move the switching member I! upwardly, or in other words, to close the socket circuit, the cam I6 is moved upwardly and to open the socket circuit, the cam it is moved downwardly, for the relation of the parts shown in Figs. 9-12 inclusive. The side walls of the recess llib serve asguideways for the switching member l7, said side walls being sufliciently spaced to permit lateral expan-.

sion of said switching member under the action of the cam l6. r

The base it and the parts secured thereto, as

well as the switching mechanism carried by the base, are enclosed first by a tubular sleeve 2E3 of insulating material (Fig. 4) and then by a shell 2| of thin metal around said sleeve, which shell is extended below the base ill to form the necessary compartment for making connection between the socket terminals and the electric conductors used to supply current to the socket. The lower end of the shell 2| is formed inwardly and upwardly and threaded as shown at Zla (Fig. l), to mount the socket structure on any desired support. A perforated disc 22 of insulating material is preferably disposed in the lowerportion of the shell 2l to prevent contact between said shell and the electric conductors used in connecting the socket terminals with the supply circuit. 7 T

The cam It has threaded engagement with a screw 23 which is permanently a part of a button 2 mounted outside of the shell 25, refera'bly by molding the material of i the button around said screw, (Fig. 4), so that the cam l5 may be moved as above described by corresponde ing movement of the button 241. The button 24 is provided with a shouldered portion 24a (Fig. 4) which passes through :a corresponding slot 25 (Fig. 6) in the sleeve 2% and a similar slot in the shell 2l. Movement of the button 24, upwardly relatively to the shell 2i is limited'by the recess lflb, and movement downwardly of said button is limited by the slot 25. The cam 15 is secured to a shield portion lta (Figs. 13 and l l) preferably of insulating material covering the recess lilb and also the slot 25 for different positions of the cam relatively to the base' it. The shield IE0; is contained in a shallow recess i ii in the base H), the side edges of said recess forming guideways for said shield duringmovementcf thelat- V ter with the cam l6.

The switch contact I9 is electrically connected by the rivet IS with the tubular member I I (Figs. 1 and 8), and the switch contact i8 is extended along the bottom of the base l and is integrally a part of the termina1 and binding post 26 contained in a side recess we in the base It, said switch contact 58 having an extension its by which the contact is rigidly secured to the base by means of a rivet 21 (Figs. 1, 7 and 8).

The base Ii! is held in place in the shell 2! by means of an inwardly extending formed lug 2lb engaging a bayonet groove l0) in the side of the base l0 (Figs. 4 and 5).

The socket construction described, reduces the height of the structure to that required for receiving and supporting a lamp bulb and for connecting the socket terminals with electric supply conductors. This is a marked advantage where it is desired to use switch sockets with small lamp standards such as boudoir lamps, because of detracting but little if at all from the effect of the designs of such standards, and because of keeping the lamp bulbs in a low position relatively to the standards, both of which effects are of the greatest importance in connection with portable electric lamps. At the same time, the switching mechanism of the invention is of simple and inexpensive construction, free from complication, and most effective in operation.

While I have shown my invention in the particular embodiment described, I do not limit myself thereto as I may employ equivalents thereof without departing from the scope of the appended claims.

Having thus described my invention, what I claim is:

l. A switch socket including in combination a base of insulating material having an end recess for receiving and supporting a lamp bulb having electric terminals, said base having a first side recess for switching mechanism, a cam mounted in said first side recess for reciprocatory movement axially of said socket, a switching member in said first side recess and having a projection pressing against said cam and restricted to recipi rocatory movement axially of said socket, said first side recess opening outwardly through the side of said base and, also axially through the end of said base remote from its said end recess,

switch contacts spaced from each other and a mounted on the said remote end of said base and ending in line with said first side recess, the interengaging portions of said cam and of said switching member effecting axial movement of said switching member in a direction opposite to the direction of axial movement of said cam, a removable casing surrounding said base, an operating button outside of said casing and connected with said cam, said casing having an axial slot therethrough for receiving said button connection, said base having electric contacts for engaging said bulb terminals, and socket terminals in additional side recesses in said base spaced from each other and from said first side recess, said switch contacts having electrical connection with one of said base contacts and with one of said socket terminals respectively, and the other of said socket terminals having electrical connection with the other of said base contacts, said switching member in one of its positions electrically connecting said switch contacts and by movement to its other position breaking electrical connection between said switch contacts.

2. A switch socket including in combination a base of insulating material having an end recess for receiving and supporting a lamp bulb having electric terminals, said base having a first side recess for switching mechanism, a cam mounted in said first side recess for reciprocatory movement axially of said socket, a switching member in said first side recess and having a projection pressing against said cam and restricted to reciprocatory movement axially of said socket, said first side recess opening outwardly'through the side of said base and also axially through the end of said base remote from its said end recess, switch contacts spaced from each other and mounted on the said remote end of said base and ending in line with said first side recess, the interengaging portions of said cam and of said switching member effecting axial movement of said switching member in a direction opposite to the direction of axial movement of said cam, a removable casing surrounding said base, an oper ating button outside of said casing and connected with said cam, said casing having an axial slot therethrough for receiving said button connection, said base having electric contacts for engaging said bulb terminals, socket terminals in additional side recesses in said base spaced from each other and from said first side recess, said switch contacts having electrical connection with one of said base contacts and with one of said socket terminals respectively, and the other of said socket terminals having electrical connection with the other of said base contacts, said switching member in one of its positions electrically connecting said switch contacts and by movement to its other position breaking electrical connection between said switch contacts, and a shield connected with said cam and covering said slot.

3. A switch socket including in combination a base of insulating material having an end recess for receiving and supporting a lamp bulb having electric terminals, said base having a first side recess for switching mechanism, a cam mounted in said first side recess for reciprocatory movement axially of said socket, a switching member in said first side recess and having a projection pressing against said cam and restricted to reciprocatory movement axially of said socket, said first side recess opening outwardly through the side of said base and also axially through the end of said base remote from its said end recess, switch contacts spaced from each other and mounted on the said remote end of said base and ending in line with said first side recess, the interengaging portions of said cam and of said switching member eiiecting axial movement of said switching member in a direction opposite to the direction of axial movement of said cam, a removable casing surrounding said base, an operating button outside of said casing and connected with said cam, said casing having an axial slot therethrough for receiving said button connection, said base having electric contacts for engaging said bulb terminals, and socket terminals in additional side recesses in said base spaced from each other and from said first side recess, said switch contacts having electrical connection with one of said base contacts and with one of said socket terminals respectively, and the other of said socket terminals having electrical connection with the other of said base contacts, said switching member in one of its positions elecrically connecting said switch contacts and by movement to its other position breaking electrical connection between said switch contacts, said switching member having opposite portions pressing with equal forces against opposite sides of said cam.

4. A switch socket including in combination a base of insulating material having an end recess for receiving and supporting a lamp bulb having electric terminals, said base having a first side recess for switching mechanism, a cam mounted in said first side recess for reciprocatory movement axially of said socket, a switching member in said first side recess and having a projection pressing against said cam and restricted to reciprocatory movement axially of said socket, said first side recess opening outwardly through the sideof said base and also axially through the end of said base remote from its said end recess, switch contacts spaced from each other and mounted on the said remote end of said base and ending in line with said first side recess, the interengaging portions of said cam and of said switching member effecting axial movement of said switching member in a direction opposite to the direction of axial movement of said cam, aremovable casing surrounding said base, an operating button outside of said casing and connected with aid cam, said casing having an axial slot therethrough for receiving said button connection, said base having electric contacts for engaging said bulb terminals, and socket terminals in additional side recesses in said base spaced from each other and from said first side recess, said switch contacts having electrical connection with one of said base contacts and with one of said socket terminals respectively, and the other of said socket terminals having electrical connection with the other of said base contacts, said switching member in one of its positions electrically connecting said switch contacts and by movement to its other position breaking electrical connection between said switch contacts, said switching member having opposite portions provided with similar projections extending towards each other, and said cam having opposite cam surfaces for engaging said switching'member projections.

5. A switch socket including in combination a base of insulating material having an end recess for receiving and supporting a lamp bulb having electric terminals, said base having a first side recess for switching mechanism, a cam mounted in said first side recess for reciprocatory movement axially of said socket, a switching member in said first side recess and having a projection pressing against said cam and restricted to reciprocator movement axially of said socket, said first side recess opening outwardly through the side of said base and also axially through the end of said base remote from its said end recess, switch contacts spaced from each other and mounted on the said remote end of said base and ending in line with said first side recess, the interengaging portions of said cam and of said switching member effecting axial movement of said switching member in a direction opposite to the direction of axial movement of said cam, a removable casing surrounding said base, an operating button outside of said casing and connected with said cam, said casing having an axial slot therethrough for receiving said button connection, said base having electric contacts for engaging said bulb terminals, and socket terminals in additional side recesses in said base spaced said socket terminals respectively, and the other of said socket terminals having electrical confor receiving and supporting a lamp bulb having electric terminals, said base having a first side recess for switching mechanism, a cam mounted in said first side recess for reciprocatory movement axially of said socket, a switching member in said first side recess and havinga projection pressing against said cam and restricted to reciprocatory movement axially of said socket, said first side recess opening out- 7' Wardly through the side of said base and also axially through the end of said base remote from.

its said end recess, switch contacts spaced from each other and mounted on the said remote end "or" said base and ending in line with said first side recess, the interengaging portions of said cam and of said switching member effecting axial movement of said switching member in a direction opposite to the direction of axial movement of said cam, a removable casing surrounding said base, an operating button outside of said casing and connected with said cam, said casing having an axial slot therethrough for receiving said button connection, said base having electric contacts for engaging said bulb terminals, and socket terminals in additional side recesses in said base spaced from each other and from said first side recess, said switch contacts having electrical convnection with one of said base contacts and with one of said socket terminals respectively, and the other of said socket terminals having electrical connection with the other of said base contacts, said switching member in one of its positions electrically connecting said switch contacts and by movement to its other position breaking electrical connection between said switch contacts, said switching member comprising a metal strip bent into a U shape and a contact block carried by its mid-portion for engaging said switch contacts, said switch member having its side members on opposite sides of and for engagement with said cam.

v 7. A switch socket. including in combination a base of insulating material having an end recess for receiving and supporting a lamp bulb, said base having a side recess for switching mechanism,'a cam mounted in said side recess for reciprocatory movement axially of said socket, a switching member in said side recess and having a projection pressing against said cam and restricted to reciprocatory movement axially of said socket, switch contacts spaced from each other and mounted onsaid base and ending-in line with said side recess, the interengaging portion of said cam and of said switching member effecting axial movement of said switching member in a direction opposite to the direction of axial movement of said cam, and an operating button connected with said earn, said switch contacts having electrical connections for controlling current flow through a lamp bulb in said end recess, said switching member in one of its positions electrically connecting said switch contacts and by movement to its other position breaking electrical connection between said switch contacts.

e 8. A switch socket including in combination a base of insulating material having an end recess for receiving and supporting a lamp bulb, said base having a side recess for switching mechanism, a cam mounted in said side recess for reciprocatory movement axially of said socket, a switching member in said side recess and having a projection pressing against said cam and restricted to reciprocato-ry movement axially of said socket, switch contacts spaced from each other and mounted on said base and ending in line with said side recess, the interengaging portions of said cam and of said switching member eiiecting axial movement of said switching member in a direction opposite to the direction of axial movement of said cam, and an operating button connected with said cam, said switch contacts having electrical connections for controlling current flow through a lamp bulb in said end recess, said switching member in one of its positions electrically connecting said switch contacts and by movement to its other position breaking electrical connection between said switch contacts, said switching member having opposite portions pressing with equal forces against opposite sides of said cam.

9. A switch socket including in combination a base of insulating material having an end recess for receiving and supporting a lamp bulb, said base having a side recess for switching mechanism, a cam mounted in said side recess for reciprocatory movement axially of said socket, a switching member in said side recess and having a projection pressing against said cam and restricted to reciprocatory movement axially of said socket, switch contacts spaced from each other and mounted on said base and ending in line with said side recess, the interengaging portions of said cam and of said switching member effecting axial movement of said switching member in a direction opposite to the direction of axial movement of said cam, and an operating button connected with said cam, said switch contacts having electrical connections for controlling current fiow through a lamp bulb in said end recess, said switching member in one of its positions electrically connecting said switch contacts and by movement to its other position breaking electrical connection between said switch contacts, said switching member having opposite portions provided with similar projections extending towards each other, and said cam having opposite cam surfaces for engaging said switching member projections.

10. A switch socket including in combination a base of insulating material having an end recess for receiving and supporting a lamp bulb, said base having a side recess for switching mechanism, a cam mounted in said side recess for reciprocatory movement axially of said socket, a switching member in said side recess and having a projection pressing against said cam and restricted to reciprocatory movement axially of said socket, switch contacts spaced from each other and mounted on said base and ending in line with said side recess, the interengaging portions of said cam and or" said switching member effecting axial movement of said switching member in a direction Opposite to the direction of axial movement of said cam, an operating button connected with said cam, said switch contacts having electrical connections for controlling current flow through a lamp bulb in said end recess, said switching member in one of its positions electrically connecting said switch contacts and by movement to its other position breaking electrical connection between said switch contacts, and a removable casing around the side and around the end of said base remote from its said end recess and having an end clearance from said remote end restricted to that required for electric supply conductors.

11. A switch socket including in combination a base of insulating material having an end recess for receiving and supporting a lamp bulb, said base having a side recess for switching mechanism, a cam mounted in said side recess for reciprocatory movement axially of said socket, a switching member in said side recess and having a projection pressing against said cam and restricted to reciprocatory movement axially of said socket, switch contacts spaced from each other and mounted on said base and ending in line with said side recess, the interengaging portions of said cam and or said switching member effecting axial movement oi said switching member in a direction opposite to the direction of axial movement of said cam, and an operating button connected with said cam, said switch contacts having electrical connections for controlling current flow through a lamp bulb in said end recess, said switching member in one of its positions electrically connecting said switch contacts and by movement to its other position breaking electrical connection between said switch contacts, said switching member comprising a metal strip bent into a U-shape and provided at its mid-portion with a contact block for engaging said switch contacts and having its side members on opposite sides of and in engagement with said cam.

12. Switching mechanism for electric lamp sockets, including in combination a cylindrical base of insulating material having an end recess for a lamp socket and a wall extending laterally at the inner end of said socket recess limited in thickness to that required for mounting a lamp socket in said socket recess, the axial length of said base being limited to the combined axial length of said socket recess and the thickness of said end wall, said base also having a side recess opening laterally through the side of said base, spaced switch contacts in line with said side recess, a switching member contained in said side recess and movable therein to electrically connect and electrically separate said switch contacts as desired, and a cam contained in said side recess and movable therein to operate said switching member, said switching member having opposite portions provided with similar projections extending towards each other, and said cam having opposite cam surfaces for engaging said switching member projections.

13. Switching mechanism for electric lamp sockets, including in combination a cylindrical base of insulating material having an end recess for a lamp socket and a wall extending laterally at the inner end of said socket recess limited in thickness to that required for mounting a lamp socket in said socket recess, the axial length of said base being limited to the combined axial length of said socket recess and the thickness of said end wall, said base also having a side recess opening laterally through the side of said base, spaced switch contacts in line with said side recess, a switching member contained in said side recess and movable therein to electrically connect and electrically separate said switch contacts as desired, and a cam contained in said side recess and movable therein to operate said switching member, said switching member comprising a 11 metal strip bent intca U shape and provided at itsmid-portion with a contact block for engaging said switch contacts and having its side members on opposite sides of and in engagement with said cam. V

7 l4. Switching mechanism for electric lamp sockets, including in combination a cylindrical base of insulating material having an end recess fora lamp socket and a wall extending laterally at the inner end of said socketrecess limited in thickness to that required for mounting a lamp socketin said socket recess, the axial length of said base being limited to the combinedaxial length of saidsocketrecessand thethickness of said end wall, said base also, having a side recess opening laterally through the side of, said base, spaced switch contacts in line withsaid siderecess, a switching member contained in said side recess andmovable therein to electrically connect and electrically separate said switch contacts as desirectand. a cam contained in said side recess and movable therein to operate said switching ember, said switching member comprising a strip. of thin spring metalbent to engage opposite sidesof saidcam with equal pressures and provided with a contact block to cooperate with said switch contacts.

15.. Switching mechanism for electric lamp sockets, base of insulating material having an end recess for a lamp socket and a wall extending laterally at the inner end of said socket recess limited in thickness to that required for mounting a lamp socket in said socket recess, the axial length of said. base being limitedto th combined axial length of said socket recess and the thickness of said end wall, said base also. having a side recess opening laterally through the side of said base, spacedv switch contacts in line with said side re.- cess, a switching, member contained in said side recessand movabl therein to electrically connect and electrically separate said switch. contacts as desired, and a cam contained in said side recess and movable therein to operate said switching member said switching member comprising a strip ofthin spring metalbent to engage opposite sidesi f.saidcamnwith, equal pressures and pro.-

vid dwith a contact block. to cooperate with said switch contacts, aid switching member being fre fro nponnection with said base and with saidcam including in combination a cylindrical switch contacts.

wit h ember and;

. 12 t r and being limited in its movement solely by said cam, by the walls of said side recess and by said 16. Switching mechanism, for electric lamp sockets, including in combination a, cylindrical base of insulating material having an endrecess for a lamp socket and a wall extending laterally at the inner end of said socket recess limited in thickness to that required for mounting a lamp socket in said socket recess, the axial length of said base being limited to the combined axial length of said socket recess and the thickness of said end wall, said base also having 'a side recess opening laterally through the side of said base, spaced switch contacts in line with said side recess, a switching member contained in said side recess and movable therein to electrically connect and electrically separate said switch contacts as desired, and a' cam contained in said side recess and movable therein to operate said switching member, said switching member being free from connection with said base and'with said cam and being limited in its movement solely, by said cam, by the walls of said side recess and by said switch contacts. i I 1?. Switching mechanism for electric lamp sockets, including in combination a cylindrical base of insulating material having an end recess for a lamp socket and a wall extendinglaterally at the inner end of said socket recess limited in,

spaced switch contacts in line with said side r e-r cess, a switching member contained in said side recess and movable therein to electrically connect and electrically separate said switch contacts as'desiredand a camcontained in said side recess and movable therein to operate said n tch n membn s id wi c in memb a said cam; being limitedto reciprocatorymovemerit towards andfromsaid switch contacts, said said cam having cooperating engaging surfaces moving said switching member in a direction opposite to the direction of movement of said cam. V

CARL BRAMMING. 

